def __package_args(self, node, field, path):
kwargs = {}
for arg in node.arguments:
slot = field.params.get(to_snake_case(arg.name.value))
if not slot:
raise RuntimeError(
f'Can not find {arg.name.value}'
f' as param in {field.name}', node, path)
kwargs[to_snake_case(arg.name.value)] = load_literal_value(
arg.value, slot)
return kwargs
def __new__(cls, name, bases, attrs):
attrs['__fields__'] = {}
attrs['__description__'] = None
attrs['__validated__'] = False
cls = dataclasses.dataclass(super().__new__(cls, name, bases, attrs))
sign = inspect.signature(cls)
cls.__description__ = inspect.getdoc(cls)
for name, t in sign.parameters.items():
cls.__fields__[to_snake_case(name)] = Field(
name=to_snake_case(name), _ftype=t.annotation, description=None, _obj=cls
)
return cls
def __new__(cls, name, bases, attrs):
cls = super().__new__(cls, name, bases, attrs)
for name in dir(cls):
attr = getattr(cls, name)
if hasattr(attr, '__is_field__'):
sign = inspect.signature(attr)
cls.__fields__[to_snake_case(name)] = ResolverField(
name=to_snake_case(name),
_ftype=sign.return_annotation,
_params=cls.remove_self(sign.parameters),
description=inspect.getdoc(attr),
_obj=cls)
return cls
def load_literal_value(node, ptype):
if isinstance(node, IntValueNode):
return int(node.value)
elif isinstance(node, FloatValueNode):
return float(node.value)
elif isinstance(node, BooleanValueNode):
return bool(node.value)
elif isinstance(node, StringValueNode):
return node.value
elif isinstance(node, NullValueNode):
return None
elif isinstance(node, ListValueNode):
return [load_literal_value(v, ptype.__args__[0]) for v in node.values]
elif isinstance(node, EnumValueNode):
value = getattr(ptype, node.value)
if not value:
raise RuntimeError(f'{node.value} is not a valid member of {type}',
node)
return value
elif isinstance(node, ObjectValueNode):
data = {}
keys = ptype.__dataclass_fields__.keys()
for field in node.fields:
name = field.name.value
if name not in keys:
name = to_snake_case(name)
data[name] = load_literal_value(
field.value, ptype.__fields__[to_snake_case(name)].ftype)
return ptype(**data)
elif isinstance(node, VariableNode):
name = node.name.value
variables = types.context.get().variables
if name not in variables:
raise RuntimeError(f'Can not find variable {name}')
variable = variables[name]
return load_variable(variable, ptype)
raise RuntimeError(f'Can not convert {node.value}', node)
async def _resolve(self, nodes, error_collector, path=[]):
self.resolve_results = {}
tasks = {}
for node in nodes:
if hasattr(node, 'name'):
path = copy(path)
path.append(node.name.value)
returned = await self.__resolve_fragment(node, error_collector,
path)
if returned:
continue
name = node.name.value
snake_cases = to_snake_case(name)
field = self.__fields__.get(snake_cases)
keys = self.__dataclass_fields__.keys()
resolver = self.__get_resover(name, node, field, path)
if not resolver:
try:
tasks[name] = (getattr(
self, name if name in keys else snake_cases), node,
field, path)
except AttributeError:
raise RuntimeError(f'{name} is not a valid node of {self}',
node, path)
else:
kwargs = self.__package_args(node, field, path)
try:
returned = resolver(**kwargs)
except Exception as e:
self.__handle_error(e, node, path, error_collector)
tasks[name] = (None, node, field, path)
continue
if isawaitable(returned):
tasks[name] = (asyncio.ensure_future(returned), node,
field, path)
else:
tasks[name] = (returned, node, field, path)
return self.__task_receiver(tasks, error_collector)
def load_variable(variable, ptype):
if isinstance(ptype, types.InputType):
data = {}
keys = ptype.__dataclass_fields__.keys()
for key, value in variable.items():
snake_cases = to_snake_case(key)
data[snake_cases if key not in keys else key] = load_variable(
value, ptype.__fields__[snake_cases].ftype)
return ptype(**data)
elif is_list(ptype):
return [load_variable(i, ptype.__args__[0]) for i in variable]
elif is_optional(ptype):
if variable is None:
return None
return load_variable(variable, ptype.__args__[0])
elif isinstance(ptype, types.EnumType):
return getattr(ptype, variable)
else:
return variable
def __get_resover__(self, name, node, field, path):
snake_cases = to_snake_case(name)
if not field:
raise RuntimeError(
f"Cannot query field '{name}' on type '{type(self)}'.", node,
path)
if not isinstance(field, ResolverField):
return None
if '__' in snake_cases:
resolver = getattr(self,
f'_{self.__class__.__name__}{snake_cases}',
None)
else:
resolver = getattr(self, snake_cases, None)
if not resolver or not resolver.__is_field__:
raise RuntimeError(
f"Cannot query field '{name}' on type '{type(self)}'.", node,
path)
return resolver
def __get_resover(self, name, node, field, path):
snake_cases = to_snake_case(name)
if not field:
raise RuntimeError(
f"Cannot query field '{name}' on type '{type(self)}'.", node,
path)
if not isinstance(field, ResolverField):
return None
if snake_cases.startswith('__'):
resolver = getattr(self, f'_{snake_cases[2:]}', None)
if not getattr(resolver, '__is_metafield__', False):
resolver = None
else:
resolver = getattr(self, snake_cases, None)
if not getattr(resolver, '__is_field__', False):
resolver = None
if not resolver:
raise RuntimeError(
f"Cannot query field '{name}' on type '{type(self)}'.", node,
path)
return resolver
